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fsi/fsi-master-gpio: Reduce turnaround clocks 

FSI_GPIO_PRIME_SLAVE_CLOCKS is the number of clocks if the
"idle" phase between the end of a response and the beginning
of the next one. It corresponds to tSendDelay in the FSI
specification.

The default value in the slave is 16 clocks. 100 is way overkill
and significantly reduces the driver performance.

This changes it to 20 (which gives the HW a bit of margin still
just in case).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Tested-by: Joel Stanley <joel@jms.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2018-05-08 11:06:39 +10:00
parent bc1099d2b2
commit 97a4e5c95b
1 changed files with 1 additions and 1 deletions
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2
drivers/fsi/fsi-master-gpio.c
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@ -49,7 +49,7 @@
#define FSI_GPIO_CRC_SIZE 4
#define FSI_GPIO_MSG_ID_SIZE 2
#define FSI_GPIO_MSG_RESPID_SIZE 2
#define FSI_GPIO_PRIME_SLAVE_CLOCKS 100
#define FSI_GPIO_PRIME_SLAVE_CLOCKS 20
struct fsi_master_gpio {
struct fsi_master master;